<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Title</title>
</head>
<body>

</body>
<script>
	Promise.resolve().then(()=>{
		console.log(0);
		return Promise.resolve(4);
	}).then(res=>{
		console.log(res);
	});
	
	Promise.resolve().then(()=>{
		console.log(1);
	}).then(()=>{
		console.log(2);
	}).then(()=>{
		console.log(3);
	}).then(()=>{
		console.log(5);
	}).then(()=>{
		console.log(6);
	})
</script>
</html>